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Ren is one of the main characters from the anime series DearS.
Ren is one of the DearS, an alien race stranded on Earth and forced to adapt to living among humans. Ren however is a special kind of DearS, she is a so called Zero-Number and has no knowledge about things on Earth. The capsule that Ren was "stored" in was broken and she was freed, later on she was found by Takeya. Now when she is living with Takeya even tho he doesen't like it much he have to teach her about how things are done on Earth.